Security readout for executives and security teams
Plain-English summary
CKFinder for ASP.NET version 2 before 2.5.0.1 allowed logged-in users to download arbitrary server files if they knew the file path. This is mainly a confidentiality risk: sensitive configuration, source, or data files could be exposed to users who already have application access.
Executive priority
Treat as a targeted remediation item, not an emergency based on available evidence. Prioritize if CKFinder is internet-facing, broadly accessible to internal users, or hosted near sensitive server files. Upgrade during the next security maintenance window unless exposure is high.
Technical view
CVE-2016-20023 is a CWE-23 path traversal issue in CKSource CKFinder for ASP.NET before 2.5.0.1. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N, score 5.0. It requires low-privileged authenticated access and impacts confidentiality only, according to the provided record.
Likely exposure
Organizations are likely exposed only where CKFinder for ASP.NET version 2 earlier than 2.5.0.1 is deployed and reachable by authenticated users. The provided data does not indicate other CKFinder platforms or versions are affected.
Exploitation context
No source provided indicates active exploitation, and the CVE is not listed as KEV in the bundle. Exploitation requires authentication and knowledge or guessing of server file paths. Successful abuse could disclose files outside intended download areas.
Researcher notes
The public record is concise and does not provide exploit details, advisory text, or platform breadth beyond CKFinder for ASP.NET. The vulnerability was assigned in the 2016 namespace but appears in the bundle with 2025 publication metadata. Avoid assuming impact outside the named product and versions.
Mitigation direction
- Identify CKFinder for ASP.NET deployments and confirm installed versions.
- Upgrade affected CKFinder for ASP.NET v2 installations to 2.5.0.1 or later.
- Review CKSource release notes and vendor guidance before remediation.
- Restrict CKFinder access to trusted users until upgraded.
- Review logs for unusual authenticated file download activity.
Validation and detection
- Inventory applications using CKFinder for ASP.NET.
- Verify no deployment runs CKFinder v2 before 2.5.0.1.
- Confirm CKFinder access requires authentication and least privilege.
- Check whether sensitive files are stored near web-accessible paths.
- Review download logs for unexpected file path requests.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-23: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2016-20023 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N3.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://download.cksource.com/CKFinder/CKFinder%20for%20ASP.NET/2.5.0.1/CVE reference
- https://ckeditor.com/ckfinder/release-notes/CVE reference · release-notes
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Relative Path Traversal
Relative Path Traversal represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.